Oxygen because its atomic number is eight
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The element with 8 protons is oxygen (symbol O). It normally has 8 electrons as well, but in this case it has one extra electron, making it an ion. With 7 neutrons, the ion is known as oxygen-15.
7 protons, 7 neutrons and 7 electrons
Nitrogen-14 has 7 protons, 7 electrons, and 7 neutrons. Nitrogen-15 has 7 protons, 7 electrons and 8 neutrons. So, the only way they differ is in the NUMBER OF NEUTRONS.
According to Wikipedia neutral nitrogen has 7 protons, 7 neutrons, and 7 electrons. Nitrogen ions may have more or less electrons and other nitrogen isotopes may have more or fewer neutorns.
The atomic mass of an element is the sum of the number of protons and neutrons in the nucleus of an atom. In this case, the element has 7 protons and 8 neutrons, so the atomic mass would be 7 + 8 = 15 atomic mass units.
6 neutrons as well as 7 protons and electrons